Besides Aubameyang, Barca also worked to free Martin Braithwaite, Samuel Umtiti and Memphis Depay.
If it is not sold, the Camp Nou team can liquidate the contract soon. Depay is linked with Juventus.
Having signed Pierre-Emerick Aubameyang for free in January, Barca now want to sell the striker for at least $ 25 million to Chelsea.
According to Diario Sport, Barca are waiting for an offer of $ 25 to $ 28 million from Chelsea. The offer could come today or tomorrow 15/8 at the latest, after representatives of the player and the Stamford Bridge team negotiate with each other.